Are
you in the dog house because you betrayed your loved ones? If only there's
a magical neurochemical that you can give them to restore your trust ...

Wait, there may actually be one:

Participants who received oxytocin, however, continued to invest
at similar rates regardless of whether or not their trusting behavior
had been taken advantage of. These behavioral group differences were
accompanied by differences in neural responses, as participants in the
oxytocin group showed decreases in responses in the amygdala and caudate
nucleus.

The amygdala is a region of the brain involved in emotion and fear
learning, and is rich in oxytocin receptors, whereas the caudate nucleus
has been previously linked to reward-related responses and learning
to trust .

Thus, the authors hypothesized that oxytocin decreases both fear
mechanisms associated with a potential aversion of betrayals (via the
amygdala) and our reliance on positive feedback that can influence future
decisions (via the caudate). This in turn facilitates the expression
of trust even after breaches of trust have occurred.